Performance analysis of a district heating system [Elektronski vir]
Ljubenko, Andrej ...
Lowering the exergy content of heat, required for heating purposes, can decrease the primary energy consumption. District heating systems are often an important link between facilities that generate ...heat with low exergy content and consumers. Exergetic efficiency of heat distribution is an important factor in heat supply to consumers and can serve as an optimization factor for a more sustainable distribution network operation. This paper presents a methodology for an exergy-based distribution network analysis of a district heating system. Criterions for performance evaluations are defined. They can be used to evaluate heat supply to different points in the network, or individual system components. A case study is performed on an existing district heating system. Energetic and exergetic efficiencies of supply lines are analysed. Exergy destructions and exergy losses are studied. Exergy destruction rates present less than 1 % of exergy loss rates in their separate consideration. Distribution network operation is discovered as not optimal. An optimal ratio between exergy destruction and exergy losses at fictitious mass flow rate increment is searched. It is found to be in the interval 0.34 to 0.37.
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